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Misal :
Panjang = 3x
Lebar = 1x atau x
→ Keliling = 2(p + l)
→ 72 cm = 2(3x + x)
→ 72 / 2 = 4x
→ 36 = 4x
→ x = 36/4
→ x = 9
Panjang = 3x → (3 x 9) => 27 cm
Lebar = x => 9 cm
Jadi , Luasnya ?
→ L = panjang x lebar
→ L = 27 cm x 9 cm
→ L = 243 cm² [Option C]
"Maaf apabila ada yg salah"